Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Underground Blossom
Descend into the Rusty Lake Underground and travel through the life and memories of Laura Vanderboom!
$2.99
PRICE
$2.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
4,358 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included14 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Underground Blossom: map the core Games workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Introduce a wider range of puzzles and themes.
Assumption to check: Limited puzzle variety may lead to repetitive gameplay.
Validate with people who use this workflow before building.
Hypothesis 2
Implement social features for users to share achievements.
Assumption to check: Lack of social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 3
Add a multiplayer mode for collaborative puzzle-solving.
Assumption to check: No multiplayer options for collaborative solving.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the achievement system with more rewards and feedback.
Assumption to check: Limited feedback for achievements may deter players.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Descend into the Rusty Lake Underground and travel through the life and memories of Laura Vanderboom! Travel from station to station, each metro stop symbolising a piece of Laura's past and future. Solve various puzzles, find the correct metro to board and uncover one of Laura’s timelines, while simultaneously helping her make sense of her life and escape the corruption of her mind! Underground Blossom is a new point-and-click adventure developed by the creators of the Cube Escape & Rusty Lake series. Features: ▪ A new experience in a familiar setting Enjoy a classic Rusty Lake point-and-click puzzle adventure with a gripping story full of mysteries and, of course, puzzles. ▪ Expect to make several stops Travel to 7 unique metro stations, each station a representation of Laura Vanderboom’s life, memories and potential future. The estimated travel time is 2 hours. ▪ You know what to do Unravel the potential secrets hidden in each metro station, earn achievements and who knows what else you might stumble upon! ▪ Don’t forget your headphones At each metro stop you will be greeted by an atmospheric soundtrack by Victor Butzelaar, including a cello performance by Sebastiaan van Halsema!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Redux
react-navigation
react-native-gesture-handler
TypeScript
BUILD KIT DIFFICULTY
Intermediate
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
